Automation isn’t just about replicating an existing manual processes. Yes we want the same end results, but the process will have to be different because it’s a dumb computer doing it and not a human.
Humans are really good at spotting patterns, including ones we’ve never seen before. A human operator will be able to say “this looks right”, and also “this doesn’t look right, I’d better tell someone”. We can’t realistically design IAM solutions to do that for all possible permutations of “looks right” and “doesn’t look right” – so our designs must include the expectation that bad data will come through, the IAM solution will have no way to “know” the data is bad, and undesired results may ensue.